Centerless grinder gauging mechanism



Nov. 27, 1945. E. 1.. KUHNS 2,389,787

CENTERLESS GRINDER GAUGING MECHANISM Filed Aug. 25, 1944 INVENTOR. ERNEST L. KUHNS.

Patented Nov. 27, 1945 CENTERLESS GRINDER GAUGING MECHANISM Ernest L. Kuhns, Cleveland, Ohio, assignor to The Cleveland Metal Hardening Company, Cleveland, Ohio, a corporation of Ohio Application August 25, 1944, Serial No. 551,133

4 Claims.

This invention relates, as indicated, to an attachment for centerless grinders, but has reference more particularly for an attachment which is especially adapted for use in the centerless grinding of tapered pins and the like.

A primary object of the invention is to provide an attachment of the character described, whereby tapered pins which are to be ground can be accurately positioned between the grinding wheels in a position to be ground, whereby uniformity in size and finish of tapered pins may be assured.

Another object of the invention is to provide an attachment of the character described embodying taper in, positioning or gauging means which can be easily and quickly manipulated by the operator with one hand.

A further object of the invention is to provide an attachment of the character described which consists of a minimum number of inexpensively manufactured and easily assembled parts.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawing, forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same.

Fig. 1 is a fragmentary perspective view, showing the novel attachment of the present invention;

Fig, 2 is a fragmentary side elevational view, showing the attachment, and

Fig. 3 is a fragmentary elevation, as viewed from the right of Fig. 2, showing the attachment.

Referring more particularly to the drawing, there is shown a more or less conventional centerless grinding machine for finish grinding tapered pins, such machine comprising a fixed grinding wheel I, a laterally shiftable grinding wheel 2, a work rest 3, which is rigidly secured to the bed of the machine at a position between the two grinding wheels, and a work support blade 4. The grindin wheels I and 2, in this instance, are tapered to conform with the finish taper of the pin P, which is to be ground.

In the normal prior practice of grinding tapered pins, the wheel 2 is swung away from the wheel I, the pin P which is to be ground is manually inserted between the wheels upon the blade 4, the Wheel 2 swung towards the wheel I, and the pin ground while the operator holds a hardwood stick or the like in abutting relationship to the two grinding wheels and the pin. This method of holding the pin in position to be ground, aside from difficulties experienced in :properly holding the pin, resulted in variations of .002 to .005 of an inch in the finished product.

In accordance with the present invention, such variations are virtually eliminated by the use of the attachment to be now described.

The attachment comprises a frame member 5 formed of sheet metal and having a base flange 6, whereby the frame member may be secured, as by bolts I, to a rest-supporting member 8, which, in turn, is bolted to the bed of the machine. The frame 5 is provided in its upper edge, centrally of its ends, with a substantially V-shaped notch or recess 9, which is disposed adjacent one end of the work-support blade 4.

The attachment further includes a gate member I0, also formed of fairly light gauge sheet metal, which is pivotally secured, as by a pivot pin I I, to the frame member 5, and is provided with a lug I2 having an embossment I3 on its inner face, which is adapted to be brought into abutting relationship with the larger end of the tapered pin P, after the operator has inserted the pin through the notch or recess 9 in the frame member 5. The embossment I3 is so disposed that when swung to gauging position the gauging surface thereof will be disposed between the grinding wheels I and 2. To facilitate movement of the embossment I3 into the aforesaid abutting relationship with the tapered pin, the gate member In is provided with a flange I4, which constitutes a thumb piece, enabling the gate member to be swung downwardly about the pin II and against the tension of a coil spring I5, which interconnects the flange 6 of the frame member with a flange IS on the gate member.

The spring I-5 maintains the gate member ID swung normally upwardly, thereby permitting insertion and ejection of the tapered pins, while the thumb-piece I4 permits the operator to conveniently swing the gate member downwardly after the pin has been inserted between the grinding wheel and onto the work-support blade 4, and while holding the pin with the finger.

It will be noted that the various parts are so proportioned and related that the aforesaid thumb and finger action can be effected with one hand.

It is to be understood that the form of my invention, herewith shown and described, is to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to, without departing from the spirit of my invention, or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. In an attachment for centerless grinders and the like, a frame member, a gate member pivotally secured to said frame member and having gauging means adapted to be brought into abutting relationship with one end of the work to be ground when said gate member'is swung in one direction, and spring means normally biasing said member to swing in the opposite direction.

2. In an attachment for centerless grinders and the like, a frame member having a recess therein disposed adjacent one end of the worksupport blade of said grinder, a gate member pivotally secured to said frame member and having gauging means movable, when said gate member is swung downwardly, to a position adjacent said recess and into abutting relationship with work supported by said blade, and spring means operative to normally maintain said gate member away from said frame member.

3. In an attachment for centerless grinders and the like, a frame'member, a gate membershiftably supported by said frame member and having gauging means adapted to be shifted into a position between the grinding wheels and into abutting relationship with one end of the work to be ground when said gate member is shifted in one direction, and actuating means normall biasing said member to swing in the opposite direction.

4. In an attachment for centerless grinders and the like, a frame member having a recess therein disposed adjacent one end of the work-support blade of said grinder, a gate member shiftably supported by said frame member and having gauging means movable, when said gate member is shifted downwardly to a position adjacent said recess and into abutting relationship with work supported by said blade, and gate shifting means operative to normally maintain said gate mem- 20 her away from said frame member.

ERNEST L. KUHNS. 

